Ever wondered about the world of Marvel's Doctor Strange, but been afraid to ask? Look no further…

A new sneak peek video from the upcoming movie has been revealed, which explains how Benedict Cumberbatch, Tilda Swinton and Chiwetel Ejiofor became the cosmic Avengers comic book fans have been waiting for.

Ejiofor speaks about his character in the clip, saying: "[Baron Karl] Mordo certainly is the intro to this Doctor Strange universe. Mordo's very close with the Ancient One, played by Tilda Swinton."